Directional drilling assembly



FIG. 1 is a front elevation view of a directional drilling assembly showing our new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof; and,

FIG. 4 is a rear elevation view thereof.

Broken lines in FIGS. 1-6 are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a directional drilling assembly, as shown and described. 